scholarly journals Preventing rattailed maggot incursion into dairy sheds

2009 ◽  
Vol 62 ◽  
pp. 99-102 ◽  
Author(s):  
D.J. Wilson ◽  
P.J. Gerard ◽  
J.E. de Villiers
Keyword(s):  
Organic Matter ◽  
New Zealand ◽  
Scale Model ◽  
Small Scale ◽  
Dairy Effluent ◽  
Barrier Methods ◽  
Sensitive Areas ◽  
High Concentrations ◽  
Set Up ◽  
Small Scale Model

Rattailed maggots are the larvae of hover flies (Diptera Syrphidae) of which there are about 40 species in New Zealand many of them native The adults are important pollinators and the larvae live in water and mud feeding on rotting organic matter High concentrations occur in dairy effluent bunkers and become health and sanitary issues when prepupal larvae seeking suitable pupation sites exit bunkers and invade nearby dairy sheds Replicated small scale model bunkers were set up to test barrier methods that could prevent maggots entering sensitive areas and divert them to suitable pupation sites Known numbers of migratory prepupal larvae were placed in the model bunkers and their movements recorded over a timed period Both round piping and angular strips proved effective barriers while soil sand and sawdust were all equally attractive as a pupation medium

Effects of type of flow, plants and addition of organic carbon in the removal of zinc and chromium in small-scale model wetlands

2007 ◽  
Vol 56 (3) ◽  
pp. 199-205 ◽  
Author(s):  
D. Paredes ◽  
M.E. Vélez ◽  
P. Kuschk ◽  
R.A. Mueller
Keyword(s):  
Organic Matter ◽  
Removal Rate ◽  
Typha Latifolia ◽  
Surface Flow ◽  
Synthetic Wastewater ◽  
Scale Model ◽  
Small Scale ◽  
Significant Difference ◽  
The Impact ◽  
Small Scale Model

Constructed wetlands are used for the treatment of wastewater containing metals. In order to clarify the role of plants, flow and the impact of organic matter, an investigation of three factors, each at two different levels, was carried out in small-scale model wetlands. The evaluated factors and levels were: type of flow (subsurface and surface); presence of plants (planted with Typha latifolia and unplanted) and addition of organic matter (with and without). Eight different experimental units were run for a year. The units were fed with synthetic wastewater containing chromium (VI) (1.5 mg L−1), zinc (1.5 mg L−1), macro, micronutrients and organic matter (to those units in which this factor was being investigated). Subsurface flow wetlands showed a significantly higher rate of chromium removal in comparison with surface flow systems (97 and 60 mg m−2 d−1, respectively). Planted systems removed significantly more chromium compared to unplanted systems (85 and 76 mg m−2 d−1, respectively), and the addition of organic matter increased the removal rate in a comparison with the units without it (88 and 69 mg m−2 d−1, respectively). Similar results were found for zinc; however, the addition of organic matter made no significant difference to zinc removal.

scholarly journals Blast Wave Assessment in a Compound Survival Container: Small-Scale Testing

Proceedings ◽  
2018 ◽  
Vol 2 (8) ◽  
pp. 540
Author(s):  
A. Caçoilo ◽  
R. Mourão ◽  
B. Belkassem ◽  
F. Teixeira-Dias ◽  
J. Vantomme ◽  
...  
Keyword(s):  
Blast Wave ◽  
Scaling Laws ◽  
Scale Model ◽  
Small Scale ◽  
Multiple Reflections ◽  
Element Analysis ◽  
Time Histories ◽  
Blast Wave Propagation ◽  
Set Up ◽  
Small Scale Model

Propagation of shock waves in partially- or fully-confined environments is a complex phenomenon due to the possibility of multiple reflections, diffractions and superposition of waves. In a military context, the study of such phenomena is of extreme relevance to the evaluation of protection systems, such as survival containers, for personnel and equipment. True scale testing of such structures is costly and time consuming but small-scale models in combination with the Hopkinson-Cranz scaling laws are a viable alternative. This paper combines the use of a small-scale model of a compound survival container with finite element analysis (with LS-DYNA) to develop and validate a numerical model of the blast wave propagation. The first part of the study details the experimental set-up, consisting of a small-scale model of a survival container, which is loaded by the detonation of a scaled explosive charge. The pressure-time histories are recorded in several locations of the model. The second part of the study presents the numerical results and a comparison with the experimental data.

Wave Energy Hyperbaric Device for Electricity Production

2007 ◽  
Author(s):  
Segen F. Estefen ◽  
Paulo Roberto da Costa ◽  
Eliab Ricarte ◽  
Marcelo M. Pinheiro
Keyword(s):  
Power Generation ◽  
Wave Energy ◽  
Experimental Results ◽  
Electricity Production ◽  
Scale Model ◽  
Small Scale ◽  
Regular Waves ◽  
Hyperbaric Chamber ◽  
Small Scale Model

Wave energy is a renewable and non-polluting source and its use is being studied in different countries. The paper presents an overview on the harnessing of energy from waves and the activities associated with setting up a plant for extracting energy from waves in Port of Pecem, on the coast of Ceara State, Brazil. The technology employed is based on storing water under pressure in a hyperbaric chamber, from which a controlled jet of water drives a standard turbine. The wave resource at the proposed location is presented in terms of statistics data obtained from previous monitoring. The device components are described and small scale model tested under regular waves representatives of the installation region. Based on the experimental results values of prescribed pressures are identified in order to optimize the power generation.

Staged-Air Ratio Optimization for a New Down-Fired Technology within a Cold Small-Scale Model of a 350 MWeUtility Boiler

2011 ◽  
Vol 25 (4) ◽  
pp. 1485-1496 ◽  
Author(s):  
Min Kuang ◽  
Zhengqi Li ◽  
Pengfei Yang ◽  
Jinzhao Jia ◽  
Qunyi Zhu
Keyword(s):  
Scale Model ◽  
Small Scale ◽  
Ratio Optimization ◽  
Small Scale Model

scholarly journals Monitoring deformation of small scale model tunnels under load testing

Survey Review ◽  
2014 ◽  
Vol 46 (339) ◽  
pp. 417-425 ◽  
Author(s):  
H-M. Chen ◽  
M. Smith ◽  
H-S. Yu ◽  
N. Kokkas
Keyword(s):  
Scale Model ◽  
Small Scale ◽  
Load Testing ◽  
Small Scale Model

A small-scale model of factor VIII and factor IX fractionation from plasma

1989 ◽  
Vol 10 (4) ◽  
pp. 279-286 ◽  
Author(s):  
Peter Feldman ◽  
Lowell Winkelman ◽  
Helen Evans ◽  
Martin Pinnell ◽  
Fiona Murdoch ◽  
...  
Keyword(s):  
Factor Viii ◽  
Factor Ix ◽  
Scale Model ◽  
Small Scale ◽  
Small Scale Model

A Small Scale Model for Seismic Imaging Systems

1972 ◽  
pp. 195-213 ◽  
Author(s):  
M. G. Maginness ◽  
G. B. Cook ◽  
L. G. Higgens
Keyword(s):  
Seismic Imaging ◽  
Imaging Systems ◽  
Scale Model ◽  
Small Scale ◽  
Small Scale Model
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